Stability of supported platinum sulfuric acid decomposition catalysts for use in thermochemical water splitting cycles
Stability of supported platinum sulfuric acid decomposition catalysts for use in thermochemical water splitting cycles
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DOI：
10.1016/j.ijhydene.2006.06.053
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发表时间：
2007-03
影响因子：
7.2
通讯作者：
D. Ginosar;L. Petkovic;A. Glenn;K. Burch
中科院分区：
文献类型：
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作者：
D. Ginosar;L. Petkovic;A. Glenn;K. Burch
考察了几种金属氧化物负载铂催化剂在硫酸分解反应中的活性和稳定性。酸分解反应是几种硫基热化学水裂解循环所共有的。反应使用浓液体硫酸（96wt%）的进料在大气压下在800 - 850 ℃的温度和52 g酸/g催化剂/h的重量时空速下进行。反应在高空速下进行，使得动力学的变化不会被过剩的催化剂掩盖。暴露于反应条件的影响进行了探索三种催化剂; 0.1-0.2wt%的铂负载在氧化铝，氧化锆和二氧化钛。高比表面积的Pt/Al_2O_3和Pt/ZrO_2催化剂活性最高，但失活较快。低比表面积Pt/TiO 2催化剂在短期试验中具有良好的稳定性，但在连续运行200 h后活性缓慢丧失。
The activity and stability of several metal oxide supported platinum catalysts were explored for the sulfuric acid decomposition reaction. The acid decomposition reaction is common to several sulfur based thermochemical water splitting cycles. Reactions were carried out using a feed of concentrated liquid sulfuric acid (96wt%) at atmospheric pressure at temperatures between 800 and 850∘C and a weight hour space velocity of 52g acid/g catalyst/h. Reactions were run at high space velocities such that variations in kinetics were not masked by surplus catalyst. The influence of exposure to reaction conditions was explored for three catalysts; 0.1–0.2wt% Pt supported on alumina, zirconia and titania. The higher surface area Pt/Al2O3and Pt/ZrO2catalysts had the highest activity but deactivated rapidly. A low surface area Pt/TiO2catalyst had good stability in short term tests, but slowly lost activity for over 200h of continuous operation.